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Large low-frequency noise is found in some perovskite relaxor ferreoelectricswhen they are polarized, regardless of whether the polarization is accompaniedby an applied electric field. The noise appears both in the ferroelectric andrelaxor states, including in the nominally ergodic paraelectric state attemperatures above the susceptibility peak. Since it is present whenever thesamples are microphonic due to piezoelectricity but not evident when they arenot microphonic, it appears to be a response to mechanical strain changes.Dependence of the noise on sample thermal history indicates thatnon-equilibrium strain relaxation is the source, even in the temperature rangefor which the sample is nominally ergodic. Non-equilibrium noise in the absenceof net piezoelectricity is found at somewhat higher frequencies.

Non-equilibrium Strain Relaxation Noise in the Relaxor Ferroelectric (PbMg1/3Nb2/3O3)100-x( PbTiO3)x